mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-22 10:42:39 +01:00
951525e0a5
Summary:
This allows you to make some of the defs in a multiclass or `foreach`
conditional on an expression computed from the parameters or iteration
variables.
It was already possible to simulate an if statement using a `foreach`
with a dummy iteration variable and a list constructed using `!if` so
that it had length 0 or 1 depending on the condition, e.g.
foreach unusedIterationVar = !if(condition, [1], []<int>) in { ... }
But this syntax is nicer to read, and also more convenient because it
allows an else clause.
To avoid upheaval in the implementation, I've implemented `if` as pure
syntactic sugar on the `foreach` implementation: internally, `ParseIf`
actually does construct exactly the kind of foreach shown above (and
another reversed one for the else clause if present).
Reviewers: nhaehnle, hfinkel
Reviewed By: hfinkel
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D71474
146 lines
4.8 KiB
TableGen
146 lines
4.8 KiB
TableGen
// RUN: llvm-tblgen %s | FileCheck %s
|
|
// RUN: not llvm-tblgen -DERROR1 %s 2>&1 | FileCheck --check-prefix=ERROR1 %s
|
|
// RUN: not llvm-tblgen -DERROR2 %s 2>&1 | FileCheck --check-prefix=ERROR2 %s
|
|
// RUN: not llvm-tblgen -DERROR3 %s 2>&1 | FileCheck --check-prefix=ERROR3 %s
|
|
|
|
#ifdef ERROR1
|
|
// Refer to a variable we haven't defined *yet*, expecting an error.
|
|
// ERROR1: [[@LINE+1]]:22: error: Variable not defined: 'myvar'
|
|
def bad { dag x = (? myvar); }
|
|
#endif
|
|
|
|
// Define a global variable.
|
|
defvar myvar = "foo";
|
|
|
|
#ifdef ERROR2
|
|
// Demonstrate an error when a global variable is redefined.
|
|
// ERROR2: [[@LINE+1]]:8: error: def or global variable of this name already exists
|
|
defvar myvar = "another value";
|
|
#endif
|
|
|
|
multiclass Test<int x> {
|
|
// Refer to a global variable, while inside a local scope like a multiclass.
|
|
def _with_global_string { string s = myvar; }
|
|
|
|
// Define some variables local to this multiclass, and prove we can refer to
|
|
// those too.
|
|
defvar myvar = !add(x, 100);
|
|
defvar myvar2 = "string of " # myvar;
|
|
def _with_local_int { int i = myvar; string s = myvar2; }
|
|
|
|
#ifdef ERROR3
|
|
// Demonstrate an error when a local variable is redefined.
|
|
// ERROR3: [[@LINE+1]]:10: error: local variable of this name already exists
|
|
defvar myvar = "another value";
|
|
#endif
|
|
}
|
|
|
|
// Instantiate the above multiclass, and expect all the right outputs.
|
|
|
|
// CHECK: def aaa_with_global_string {
|
|
// CHECK-NEXT: string s = "foo";
|
|
// CHECK: def aaa_with_local_int {
|
|
// CHECK-NEXT: int i = 101;
|
|
// CHECK-NEXT: string s = "string of 101";
|
|
// CHECK: def bbb_with_global_string {
|
|
// CHECK-NEXT: string s = "foo";
|
|
// CHECK: def bbb_with_local_int {
|
|
// CHECK-NEXT: int i = 102;
|
|
// CHECK-NEXT: string s = "string of 102";
|
|
defm aaa: Test<1>;
|
|
defm bbb: Test<2>;
|
|
|
|
// Test that local variables can be defined inside a foreach block, and inside
|
|
// an object body.
|
|
//
|
|
// The scopes nest (you can refer to variables in an outer block from an inner
|
|
// one), and the variables go out of scope again at the end of the block (in
|
|
// particular, you don't get a redefinition error the next time round the
|
|
// loop).
|
|
|
|
// CHECK: def nest_f1_s3 {
|
|
// CHECK-NEXT: int member = 113;
|
|
// CHECK-NEXT: }
|
|
// CHECK: def nest_f1_s4 {
|
|
// CHECK-NEXT: int member = 114;
|
|
// CHECK-NEXT: }
|
|
// CHECK: def nest_f2_s3 {
|
|
// CHECK-NEXT: int member = 123;
|
|
// CHECK-NEXT: }
|
|
// CHECK: def nest_f2_s4 {
|
|
// CHECK-NEXT: int member = 124;
|
|
// CHECK-NEXT: }
|
|
foreach first = [ 1, 2 ] in {
|
|
defvar firstStr = "f" # first;
|
|
foreach second = [ 3, 4 ] in {
|
|
defvar secondStr = "s" # second;
|
|
def "nest_" # firstStr # "_" # secondStr {
|
|
defvar defLocalVariable = !add(!mul(first, 10), second);
|
|
int member = !add(100, defLocalVariable);
|
|
}
|
|
}
|
|
}
|
|
defvar firstStr = "now define this at the top level and still expect no error";
|
|
|
|
// Test that you can shadow an outer declaration with an inner one. Here, we
|
|
// expect all the shadowOuter records (both above and below the inner foreach)
|
|
// to get the value 1 from the outer definition of shadowedVariable, and the
|
|
// shadowInner ones to get 2 from the inner definition.
|
|
|
|
// CHECK: def shadowInner11 {
|
|
// CHECK-NEXT: int var = 2;
|
|
// CHECK: def shadowInner12 {
|
|
// CHECK-NEXT: int var = 2;
|
|
// CHECK: def shadowInner21 {
|
|
// CHECK-NEXT: int var = 2;
|
|
// CHECK: def shadowInner22 {
|
|
// CHECK-NEXT: int var = 2;
|
|
// CHECK: def shadowInnerIf1 {
|
|
// CHECK-NEXT: int var = 3;
|
|
// CHECK: def shadowOuterAbove1 {
|
|
// CHECK-NEXT: int var = 1;
|
|
// CHECK: def shadowOuterAbove2 {
|
|
// CHECK-NEXT: int var = 1;
|
|
// CHECK: def shadowOuterBelowForeach1 {
|
|
// CHECK-NEXT: int var = 1;
|
|
// CHECK: def shadowOuterBelowForeach2 {
|
|
// CHECK-NEXT: int var = 1;
|
|
// CHECK: def shadowOuterBelowIf1 {
|
|
// CHECK-NEXT: int var = 1;
|
|
// CHECK: def shadowOuterBelowIf2 {
|
|
// CHECK-NEXT: int var = 1;
|
|
|
|
foreach first = [ 1, 2 ] in {
|
|
defvar shadowedVariable = 1;
|
|
def shadowOuterAbove # first { int var = shadowedVariable; }
|
|
|
|
// The foreach statement opens a new scope, in which a new variable of the
|
|
// same name can be defined without clashing with the outer one.
|
|
foreach second = [ 1, 2 ] in {
|
|
defvar shadowedVariable = 2;
|
|
def shadowInner # first # second { int var = shadowedVariable; }
|
|
}
|
|
|
|
// Now the outer variable is back in scope.
|
|
def shadowOuterBelowForeach # first { int var = shadowedVariable; }
|
|
|
|
// An if statement also opens a new scope.
|
|
if !eq(first, 1) then {
|
|
defvar shadowedVariable = 3;
|
|
def shadowInnerIf # first { int var = shadowedVariable; }
|
|
}
|
|
|
|
// Now the outer variable is back in scope again.
|
|
def shadowOuterBelowIf # first { int var = shadowedVariable; }
|
|
}
|
|
|
|
// Test that a top-level let statement also makes a variable scope (on the
|
|
// general principle of consistency, because it defines a braced sub-block).
|
|
|
|
let someVariable = "some value" in {
|
|
defvar myvar = "override the definition from above and expect no error";
|
|
}
|
|
// CHECK: def topLevelLetTest {
|
|
// CHECK-NEXT: string val = "foo";
|
|
def topLevelLetTest { string val = myvar; }
|